LVM根分区

查看lvm卷组

VG #PV #LV #SN Attr   VSize  VFree
cl   1   2   0 wz--n- 19.00g    0 

添加磁盘并将分区转换为lvm分区，新建的lvm分区为sda3

Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000af7fc

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    41943039    19921920   8e  Linux LVM
/dev/sda3        41943040   209715199    83886080   8e  Linux LVM

创建pv

pvcreate /dev/sda3

扩展vg

vgextend cl /dev/sda3

查看扩展的vg

[root@acai ~]# vgs
  VG #PV #LV #SN Attr   VSize  VFree 
  cl   2   2   0 wz--n- 98.99g 80.00g

扩展lv

[root@acai ~]# lvextend -L +79G /dev/cl/root 
  Size of logical volume cl/root changed from 17.00 GiB (4351 extents) to 96.00 GiB (24575 extents).
  Logical volume cl/root successfully resized.

刷新分区表(如果分区的文件系统为xfs，需要使用xfs_growfs)

[root@acai ~]# xfs_growfs /dev/mapper/cl-root 
meta-data=/dev/mapper/cl-root    isize=512    agcount=4, agsize=1113856 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=4455424, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 4455424 to 25164800

验证根分区

[root@acai ~]# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/cl-root   96G  1.3G   95G   2% /
devtmpfs             1.9G     0  1.9G   0% /dev
tmpfs                1.9G     0  1.9G   0% /dev/shm
tmpfs                1.9G  8.6M  1.9G   1% /run
tmpfs                1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda1           1014M  139M  876M  14% /boot
tmpfs                378M     0  378M   0% /run/user/0

标准根分区扩容

查看磁盘大小

[root@rke ~]# fdisk -l

Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0000266a

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200     6293503     2097152   82  Linux swap / Solaris
/dev/sda3         6293504    41943039    17824768   83  Linux

查看当前根分区

[root@rke ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   40G  0 disk
├─sda1   8:1    0    1G  0 part /boot
├─sda2   8:2    0    2G  0 part [SWAP]
└─sda3   8:3    0   17G  0 part /
sr0     11:0    1  906M  0 rom

重建sda3根分区分区表

[root@rke ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p

Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0000266a

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200     6293503     2097152   82  Linux swap / Solaris
/dev/sda3         6293504    41943039    17824768   83  Linux

Command (m for help): d
Partition number (1-3, default 3):
Partition 3 is deleted

Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
Select (default p):
Using default response p
Partition number (3,4, default 3):
First sector (6293504-83886079, default 6293504):
Using default value 6293504
Last sector, +sectors or +size{K,M,G} (6293504-83886079, default 83886079):
Using default value 83886079
Partition 3 of type Linux and of size 37 GiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

查看根分区磁盘格式

[root@rke ~]# mount|grep sda3
/dev/sda3 on / type xfs (rw,relatime,attr2,inode64,noquota)

动态扩容根分区

[root@rke ~]# xfs_growfs /dev/sda3
meta-data=/dev/sda3              isize=512    agcount=4, agsize=1114048 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=4456192, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0